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Greek baros : weight : pressure. Iodus "violet".
English: Barium iodide; French: Iodure de baryum; German: Jodbarium.
mother tincture Q
Minerals; Inorganic; Column Two
Clarke: A Dictionary of Practical Materia Medica, Vol. I., 253.
Description of the substance
Barium iodide occurs in two forms, one anhydrous and the other hydrated. Both are white solids. When heated, hydrated barium iodide dehydrates and the anhydrous salt can be obtained.
Barium iodide is made by the neutralization of barium carbonate with HI in water. The product crystallizes as the hydrate BaI2.2H2O [7787-33-9]. If this heated, dehydration to anhydrous BaI2 occurs.
BaCO3 + 2HI(aq) BaI2(aq)
It is also made by the reaction of BaH2 with ammonium iodide in pyridine.
To the transparent solution above obtained (phosphori acid), by decantation from any remaining phosphorus, add, in the first place, carbonate of baryta as long as effervescence ensues, and afterward a little water of baryta, so that the mixture becomes slightly alkaline. By this decomposition phosphate of baryta is formed from the phosphoric acid and the carbonate of baryta; and from the hydriodic acid, and the carbonate of baryta, iodide of barium is the resulting formation; and carbonic acid is liberated as gas. The iodide of barium, being soluble, is separated from the insoluble phosphate by filtration. A current of carbonic acid is now passed through the filtrate, in order to combine with any remaining solution of baryta, and the mixture is again filtered.